==================== Problem Description ====================
Custom View
public class Pasterview extends View
{
Private final static int mode_none = 0;
Private final static int mode_drag = 1;
Private final static int mode_zoom = 2;
private int mode = Mode_none;
private paint paint;
Private matrix matrix;
Private Bitmap Bitmap;
private float OLDX;
private float OldY;
private float firstx;
private float firsty;
private float olddistance;
Private PointF midpoint;
private float Oldangle;
Private context context;
Private Alertdialog Dialog;
Public Pasterview (Context context)
{
Super (context);
This.context = context;
Paint = new paint ();
Paint.setantialias (TRUE);
Bitmap = Bitmapfactory.decoderesource (Getresources (), R.drawable.menu_camera);
}
Public Pasterview (context context, AttributeSet attrs)
{
Super (context, attrs);
This.context = context;
Paint = new paint ();
Paint.setantialias (TRUE);
Bitmap = Bitmapfactory.decoderesource (Getresources (), R.drawable.menu_camera);
}
Public Pasterview (context context, AttributeSet attrs, int defstyle)
{
Super (context, attrs, Defstyle);
This.context = context;
Paint = new paint ();
Paint.setantialias (TRUE);
Bitmap = Bitmapfactory.decoderesource (Getresources (), R.drawable.menu_camera);
}
@Override
protected void OnDraw (canvas canvas)
{
if (bitmap! = null) {
if (Matrix = = null) {
Matrix = new Matrix ();
Matrix.posttranslate ((GetWidth ()-bitmap.getwidth ())/2, (GetHeight ()-bitmap.getheight ())/2);
Midpoint = new PointF (GetWidth ()/2, GetHeight ()/2);
}
Canvas.drawbitmap (bitmap, matrix, paint);
}
Super.ondraw (canvas);
}
@Override
public boolean ontouchevent (Motionevent event)
{
Switch (event.getaction () & Motionevent.action_mask) {
Case Motionevent.action_down:
mode = Mode_drag;
OLDX = Event.getx ();
OldY = Event.gety ();
FIRSTX = Event.getx ();
Firsty = Event.gety ();
Break
Case Motionevent.action_pointer_down:
mode = Mode_zoom;
Olddistance = Getdistance (event);
Midpoint = Getmidpoint (event);
Oldangle = Getangle (event);
Break
Case Motionevent.action_move:
if (mode = = Mode_drag) {
float x = Event.getx ();
Float y = event.gety ();
Matrix.posttranslate (X-OLDX, Y-oldy);
Midpoint.x + = (X-OLDX);
Midpoint.y + = (y-oldy);
Invalidate ();
OLDX = x;
OldY = y;
}
else if (mode = = Mode_zoom) {
float fdistance = getdistance (event);
float scale = fdistance/olddistance;
Matrix.postscale (scale, scale, midpoint.x, MIDPOINT.Y);
float angle = Getangle (event);
Matrix.postrotate ((float) ((oldangle-angle) *180/3.1415926), Midpoint.x, MIDPOINT.Y);
Invalidate ();
Olddistance = fdistance;
Oldangle = angle;
}
Break
Case MOTIONEVENT.ACTION_UP:
if (mode = = Mode_drag) {
if (Math.Abs (Firstx-event.getx ()) < 0.1 && Math.Abs (Firsty-event.gety ()) < 0.1) {
if (dialog = = null) {
Alertdialog.builder Builder = new Alertdialog.builder (context);
Builder.setmessage ("Do you want to remove the sticker?" ");
Builder.setnegativebutton (Getresources (). getString (R.string.cancel), New Dialoginterface.onclicklistener ()
{
@Override
public void OnClick (Dialoginterface dialog, int which)
{
Dialog.cancel ();
}
});
Builder.setpositivebutton (Getresources (). getString (R.string.ok), New Dialoginterface.onclicklistener ()
{
@Override
public void OnClick (Dialoginterface dialog, int which)
{
Dialog.dismiss ();
Reset ();
Setvisibility (View.gone);
}
});
Dialog = Builder.create ();
}
Dialog.show ();
}
}
mode = Mode_none;
Break
Case MOTIONEVENT.ACTION_POINTER_UP:
mode = Mode_none;
Break
}
Return Super.ontouchevent (event);
}
Public Matrix Getmatrix ()
{
return matrix;
}
public void SetMatrix (Matrix matrix)
{
This.matrix = Matrix;
}
Public Bitmap Getbitmap ()
{
return bitmap;
}
public void SetBitmap (Bitmap Bitmap)
{
This.bitmap = bitmap;
}
Private float Getdistance (Motionevent event) {
return (float) math.sqrt (Math.pow (event.getx (0)-event.getx (1), 2) + Math.pow (event.gety (0)-event.gety (1), 2));
}
Private PointF Getmidpoint (Motionevent event) {
return new PointF ((event.getx (0) + event.getx (1))/2, (event.gety (0) + event.gety (1))/2);
}
Private float Getangle (Motionevent event) {
return (float) math.atan2 (event.gety (1)-event.gety (0), Event.getx (0)-event.getx (1));
}
public void Reset () {
Matrix = null;
mode = Mode_none;
}
public void release () {
if (bitmap! = null &&!bitmap.isrecycled ()) {
Bitmap.recycle ();
bitmap = null;
}
}
Layout
<?xml version= "1.0" encoding= "Utf-8"?>
<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent" >
<relativelayout
Android:id= "@+id/rltop"
Android:layout_width= "Match_parent"
android:layout_height= "44DP"
android:background= "@color/xx_translucence_camera" >
<imageview
Android:id= "@+id/ivcancel"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:src= "@drawable/xx_cancel_shot"
Android:padding= "10DP"
android:layout_marginleft= "10DP"
Android:layout_centervertical= "true"/>
<imageview
Android:id= "@+id/ivaddpaster"
Android:layout_width= "Wrap_content"
android:layout_height= "Match_parent"
android:src= "@drawable/xxx_add_paster"
android:layout_marginright= "20DP"
Android:layout_centervertical= "true"
Android:layout_alignparentright= "true"
Android:scaletype= "Center"/>
</RelativeLayout>
<imageview
Android:id= "@+id/ivphoto"
android:layout_below= "@id/rltop"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
Android:scaletype= "Fitxy"/>
<com.xx.xxx.xxxxx.pasterview
Android:id= "@+id/pasterview"
android:layout_below= "@id/rltop"
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
Android:clickable= "true"
Android:background= "#00000000"
android:visibility= "Gone"/>
<relativelayout
Android:id= "@+id/rlmid"
android:layout_below= "@id/ivphoto"
Android:layout_above= "@+id/rlbottom"
Android:layout_width= "Match_parent"
android:layout_height= "Match_parent"
android:background= "@color/xx_translucence_camera" >
Android:layout_width= "Match_parent"
android:layout_height= "Wrap_content"
Android:scrollbars= "None"
Android:layout_alignparentbottom= "true" >
<linearlayout
Android:id= "@+id/lllens"
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
android:orientation= "Horizontal"
Android:focusable= "true"
Android:focusableintouchmode= "true" ></LinearLayout>
</HorizontalScrollView>
</RelativeLayout>
<relativelayout
Android:id= "@+id/rlbottom"
Android:layout_width= "Match_parent"
android:layout_height= "50DP"
android:background= "@color/xxx_black2"
Android:layout_alignparentbottom= "true" >
<textview
Android:id= "@+id/tvshotagain"
Android:layout_width= "Wrap_content"
android:layout_height= "Match_parent"
android:paddingleft= "10DP"
android:paddingright= "10DP"
android:layout_marginleft= "10DP"
android:text= "@string/shot_again"
android:gravity= "Center"
Android:textsize= "@dimen/button_textsize"
Android:textcolor= "@color/xxxx_album_btn_text_color"/>
<imageview
Android:id= "@+id/ivok"
Android:layout_centerinparent= "true"
Android:layout_width= "100DP"
android:layout_height= "40DP"
android:background= "@drawable/XXX_BTN_BG"
android:src= "@drawable/done"
Android:scaletype= "Center"/>
</RelativeLayout>
</RelativeLayout>
==================== Solution 1====================
Public Matrix Getmatrix ()
=
Public Matrix Mgetmatrix ()
Custom View on android2.3.3 mobile phone report null pointer on android4.2.2 phone
